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If that is a 90g tank (IMO it looks bigger) , Then I would say it is overstocked.
I personally think a full school (6) of balas would need a 200+ gallons as they can reach a whopping 13-14 inches. Clown loaches can get just as big also.
I am assumming that the 'other fish' your talking about is a BGK, They have been reported to reach 2' .
It looks very deep from front to back... I'd say its much bigger than a 90 gallon. Going off the size of the fish, I'd guess it to be at least a 150, maybe bigger.
looking at it again it prob is a 120 tall, same length as a 75 but taller and deeper but still u look at a stocking caluculater and my 3 loaches is alomst to much with 1 bala, and i have a 75gal